A Multi-Wavelength Analysis of NGC 4178: A Bulgeless Galaxy with an AGN

Abstract

We present {\it Gemini} longslit optical spectroscopy and VLA radio observations of the nuclear region of NGC 4178, a late-type bulgeless disk galaxy recently confirmed to host an AGN through infrared and X-ray observations. Our observations reveal that the dynamical center of the galaxy is coincident with the location of the {\it Chandra} X-ray point source discovered in a previous work, providing further support for the presence of an AGN. While the X-ray and IR observations provide robust evidence for an AGN, the optical spectrum shows no evidence for the AGN, underscoring the need for the penetrative power of mid-IR and X-ray observations in finding buried or weak AGNs in this class of galaxy. Finally, the upper limit to the radio flux, together with our previous X-ray and IR results, is consistent with the scenario in which NGC 4178 harbors a deeply buried AGN accreting at a high rate.

6 pages, 6 figures. Accepted for publication in the Astrophysical Journal

References in corpus (19)

• A New Sample of Low-mass Black Holes in Active Galaxies
• An actively accreting massive black hole in the dwarf starburst galaxy Henize 2-10
• The Fundamental Plane of Accretion Onto Black Holes with Dynamical Masses
• Refining the fundamental plane of accreting black holes
• Radio Detections During Two State Transitions of the Intermediate Mass Black Hole HLX-1
• The Mid-infrared Fine-structure Lines of Neon as an Indicator of Star For mation Rate in Galaxies
• Spitzer Uncovers Active Galactic Nuclei Missed by Optical Surveys in 7 Late-type Galaxies
• Dynamical Constraints on The Masses of the Nuclear Star Cluster and Black Hole in the Late-Type Spiral Galaxy NGC 3621
• Galaxy Zoo: Bulgeless Galaxies With Growing Black Holes
• The black hole fundamental plane: revisit with a larger sample of radio and X-ray emitting broad-line AGNs
• The black hole fundamental plane from a uniform sample of radio and X-ray emitting broad line AGNs
• The absence of radio emission from the globular cluster G1
• An Accreting Black Hole in the Nuclear Star Cluster of the Bulgeless Galaxy NGC 1042
• Black Hole Mass and Bulge Luminosity for Low-mass Black Holes
• Low-Level Nuclear Activity in Nearby Spiral Galaxies
• The Chandra View of NGC 4178: The Lowest Mass Black Hole in a Bulgeless Disk Galaxy?
• On the AGN radio luminosity distribution and the black hole fundamental plane
• A Chandra view of NGC 3621: a bulgeless galaxy hosting an AGN in its early phase?
• Discovery of an active supermassive black hole in the bulge-less galaxy NGC 4561

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• Discovery of a Population of Bulgeless Galaxies with Extremely Red Mid-IR Colors: Obscured AGN Activity in the Low Mass Regime?
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• On the radio properties of the intermediate-mass black hole candidate ESO 243-49 HLX-1
• An Optically Obscured AGN in a Low Mass, Irregular Dwarf Galaxy: A Multi-Wavelength Analysis of J1329+3234
• Supermassive black holes in disk-dominated galaxies outgrow their bulges and co-evolve with their host galaxies
• Defining the (Black Hole)-Spheroid Connection with the Discovery of Morphology-Dependent Substructure in the $M_{\mathrm{BH}}$--${\mathrm{n}}_{\mathrm{sph}}$ and $M_{\mathrm{BH}}$--${\mathrm{R}}_{\mathrm{e},\mathrm{sph}}$ Diagrams: New Tests for Advanced Theories and Realistic Simulations
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• X-ray spectroscopy of the candidate AGN in Henize 2-10 and NGC 4178: Likely supernova remnants
• Discovery of An Active Intermediate-Mass Black Hole Candidate in the Barred Bulgeless Galaxy NGC 3319
• Obscured AGNs in Bulgeless Hosts discovered by WISE: The Case Study of SDSS J1224+5555